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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bccad881f6741213e3738102f70f93be102a0ba9cc0b00d13d4bffbaca608b7' 
  AND token = 'CnALu0+e4MrDPX+t+kSy63K869BExtN/ezcSHoF9qyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}